This happened where I work to a road sweeper the idiot drove it for months with warning bleeping for brakes and overheating. In the end the piston welded its self to the disc. Its rumoured to of cost over 20k to sort out the overheating and brakes. I got in the sweeper last week and it started bleeping telling me the water level was low. The driver claimed it had been doing it for six months and meant it hadn't reached operating temperature. He no longer drives a sweeper. I had to defect it and put it in for repair due to several over faults. Some causing it to leave a plume of doom behind it when sweeping.